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# kern.ipc.sem


<img src="https://netdata.cloud/img/freebsd.svg" width="150"/>


Plugin: freebsd.plugin
Module: kern.ipc.sem

<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />

## Overview

Collect information about semaphore.



This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.


### Default Behavior

#### Auto-Detection

This integration doesn't support auto-detection.

#### Limits

The default configuration for this integration does not impose any limits on data collection.

#### Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

## Metrics

Metrics grouped by *scope*.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.



### Per kern.ipc.sem instance

These metrics shows counters for semaphores on host.

This scope has no labels.

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| system.ipc_semaphores | semaphores | semaphores |
| system.ipc_semaphore_arrays | arrays | arrays |



## Alerts


The following alerts are available:

| Alert name  | On metric | Description |
|:------------|:----------|:------------|
| [ semaphores_used ](https://github.com/netdata/netdata/blob/master/src/health/health.d/ipc.conf) | system.ipc_semaphores | IPC semaphore utilization |
| [ semaphore_arrays_used ](https://github.com/netdata/netdata/blob/master/src/health/health.d/ipc.conf) | system.ipc_semaphore_arrays | IPC semaphore arrays utilization |


## Setup


### Prerequisites

No action required.

### Configuration

#### Options



<details open><summary>Config options</summary>



| Option | Description | Default | Required |
|:-----|:------------|:--------|:---------:|
| kern.ipc.sem | Enable or disable semaphore metrics. | yes | no |


</details>



#### via File

The configuration file name for this integration is `netdata.conf`.
Configuration for this specific integration is located in the `[plugin:freebsd]` section within that file.

The file format is a modified INI syntax. The general structure is:

```ini
[section1]
    option1 = some value
    option2 = some other value

[section2]
    option3 = some third value
```
You can edit the configuration file using the [`edit-config`](https://github.com/netdata/netdata/blob/master/docs/netdata-agent/configuration/README.md#edit-a-configuration-file-using-edit-config) script from the
Netdata [config directory](https://github.com/netdata/netdata/blob/master/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).

```bash
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config netdata.conf
```

##### Examples
There are no configuration examples.


